<script setup>
import { userRegisterService, userLoginService } from '@/api/user.js'
import { User, Lock } from '@element-plus/icons-vue'
import { ref, watch } from 'vue'
import { useUserStore } from '@/stores'
import { useRouter } from 'vue-router'
const isRegister = ref(false)
const form = ref()

// 整个的用于提交的form数据对象
const formModel = ref({
  username: '',
  password: '',
  repassword: ''
})
// 整个表单的校验规则
// 1. 非空校验 required: true      message消息提示，  trigger触发校验的时机 blur change
// 2. 长度校验 min:xx, max: xx
// 3. 正则校验 pattern: 正则规则    \S 非空字符
// 4. 自定义校验 => 自己写逻辑校验 (校验函数)
//    validator: (rule, value, callback)
//    (1) rule  当前校验规则相关的信息
//    (2) value 所校验的表单元素目前的表单值
//    (3) callback 无论成功还是失败，都需要 callback 回调
//        - callback() 校验成功
//        - callback(new Error(错误信息)) 校验失败
const rules = {
  username: [
    { required: true, message: '请输入用户名', trigger: 'blur' },
    { min: 5, max: 10, message: '用户名必须是 5-10位 的字符', trigger: 'blur' }
  ],
  password: [
    { required: true, message: '请输入密码', trigger: 'blur' },
    {
      pattern: /^\S{6,15}$/,
      message: '密码必须是 6-15位 的非空字符',
      trigger: 'blur'
    }
  ],
  repassword: [
    { required: true, message: '请输入密码', trigger: 'blur' },
    {
      pattern: /^\S{6,15}$/,
      message: '密码必须是 6-15位 的非空字符',
      trigger: 'blur'
    },
    {
      validator: (rule, value, callback) => {
        // 判断 value 和 当前 form 中收集的 password 是否一致
        if (value !== formModel.value.password) {
          callback(new Error('两次输入密码不一致'))
        } else {
          callback() // 就算校验成功，也需要callback
        }
      },
      trigger: 'blur'
    }
  ]
}

const register = async () => {
  // 注册成功之前，先进行校验，校验成功 → 请求，校验失败 → 自动提示
  await form.value.validate()
  await userRegisterService(formModel.value)
  ElMessage.success('注册成功')
  isRegister.value = false
}

const userStore = useUserStore()
const router = useRouter()
const login = async () => {
  await form.value.validate()
  const res = await userLoginService(formModel.value)
  userStore.setToken(res.data.token)
  ElMessage.success('登录成功')
  router.push('/')
}
const reset = async () => {
  await form.value.resetFields()
}

// 切换的时候，重置表单内容
watch(isRegister, () => {
  formModel.value = {
    username: '',
    password: '',
    repassword: ''
  }
})
</script>

<template>
  <!-- 
    1. 结构相关
      el-row表示一行，一行分成24份 
       el-col表示列  
       (1) :span="12"  代表在一行中，占12份 (50%)
       (2) :span="6"   表示在一行中，占6份  (25%)
       (3) :offset="3" 代表在一行中，左侧margin份数

       el-form 整个表单组件
       el-form-item 表单的一行 （一个表单域）
       el-input 表单元素（输入框）
    2. 校验相关
       (1) el-form => :model="ruleForm"      绑定的整个form的数据对象 { xxx, xxx, xxx }
       (2) el-form => :rules="rules"         绑定的整个rules规则对象  { xxx, xxx, xxx }
       (3) 表单元素 => v-model="ruleForm.xxx" 给表单元素，绑定form的子属性
       (4) el-form-item => prop配置生效的是哪个校验规则 (和rules中的字段要对应)
  -->
  <div class="login-page bg">
    <el-card class="form-card">
      <template #header>
        <div class="card-header">
          <span>"坤坤"商城后台管理系统</span>
        </div>
      </template>
      <div class="form">
        <!-- 注册相关表单 -->
        <el-form
          :model="formModel"
          :rules="rules"
          ref="form"
          size="large"
          autocomplete="off"
          v-if="isRegister"
        >
          <el-form-item>
            <h1>注册</h1>
          </el-form-item>
          <el-form-item prop="username">
            <el-input
              v-model="formModel.username"
              :prefix-icon="User"
              placeholder="请输入用户名"
            ></el-input>
          </el-form-item>
          <el-form-item prop="password">
            <el-input
              v-model="formModel.password"
              :prefix-icon="Lock"
              type="password"
              placeholder="请输入密码"
            ></el-input>
          </el-form-item>
          <el-form-item prop="repassword">
            <el-input
              v-model="formModel.repassword"
              :prefix-icon="Lock"
              type="password"
              placeholder="请输入再次密码"
            ></el-input>
          </el-form-item>
          <el-form-item>
            <el-button
              @click="register"
              class="button"
              type="primary"
              auto-insert-space
            >
              注册
            </el-button>
          </el-form-item>
          <el-form-item>
            <el-button @click="reset" class="button" auto-insert-space>
              重置
            </el-button>
          </el-form-item>
          <el-form-item class="flex">
            <el-link type="info" :underline="false" @click="isRegister = false">
              ← 返回
            </el-link>
          </el-form-item>
        </el-form>

        <!-- 登录相关表单 -->
        <el-form
          :model="formModel"
          :rules="rules"
          ref="form"
          size="large"
          autocomplete="off"
          v-else
        >
          <el-form-item>
            <h1>登录</h1>
          </el-form-item>
          <el-form-item prop="username">
            <el-input
              v-model="formModel.username"
              :prefix-icon="User"
              placeholder="请输入用户名"
            ></el-input>
          </el-form-item>
          <el-form-item prop="password">
            <el-input
              v-model="formModel.password"
              name="password"
              :prefix-icon="Lock"
              type="password"
              placeholder="请输入密码"
            ></el-input>
          </el-form-item>
          <el-form-item class="flex">
            <div class="flex">
              <el-checkbox>记住我</el-checkbox>
              <el-link type="primary" :underline="false">忘记密码？</el-link>
            </div>
          </el-form-item>
          <el-form-item>
            <el-button
              @click="login"
              class="button"
              type="primary"
              auto-insert-space
              >登录</el-button
            >
          </el-form-item>
          <el-form-item>
            <el-button @click="reset" class="button" auto-insert-space>
              重置
            </el-button>
          </el-form-item>
          <el-form-item class="flex">
            <el-link type="info" :underline="false" @click="isRegister = true">
              注册 →
            </el-link>
          </el-form-item>
        </el-form>
      </div>
    </el-card>
  </div>
</template>

<style lang="scss" scoped>
.login-page {
  height: 100vh;
  display: flex;
  // background-color: #fff;

  &.bg {
    background: url('@/assets/login_bg.jpg') no-repeat center / cover;
    border-radius: 0 20px 20px 0;
  }

  .form-card {
    margin: auto;
    width: 40%;

    .card-header {
      text-align: center;
      font-weight: bold;
    }

    .form {
      display: flex;
      flex-direction: column;
      justify-content: center;
      user-select: none;

      .title {
        margin: 0 auto;
      }

      .button {
        width: 100%;
      }

      .flex {
        width: 100%;
        display: flex;
        justify-content: space-between;
      }
    }
  }
}
</style>
